| 초록 |
In this study, the different bisphenol-based DGEBA/DGEBS (diglycidylether of bisphenol-A/ diglycidylether of bisphenol-S) blend systems were investigated in terms of cure behaviors, thermal stabilities, and fracture toughness of the casting specimen. The contents of DGEBA/ DGEBS were varied with in the 100:0, 90:10, 80:20, 70:30, and 60:40 wt%. The cure activation energies (Ea) of the system were determined by Ozawa's equation with dynamic differential scanning calorimetry (DSC). The thermal stabilities, including initial decomposed temperature (IDT), temperatures of maximum rate of degradation (Tmax), integral procedural decomposition temperature (IPDT) of the cured specimen were investigated by thermogravimetric analysis (TGA). For the mechanical interfacial properties of the specimens, the critical stress intensity factor (KIC) test was performed and their fractured surfaces were examined by using a scanning electron microscope (SEM). As a result, Ea, IPDT, and KIC exhibited maximum values in the 20 wt% DGEBS content, compared with the neat DGEBA resins. This was probably due to the fact that the developed networks were formed by the introduction of sulfonyl groups of the DGEBS resins.
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